把children learn many valuable lessons about life on the school playground变为被动语态
题目
把children learn many valuable lessons about life on the school playground变为被动语态
答案
Many valuable lessons about life are learned by children on the school playground
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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